@samitouri / QOS-React
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1 /**
2 * Copyright (c) Meta Platforms, Inc. and affiliates.
3 *
4 * This source code is licensed under the MIT license found in the
5 * LICENSE file in the root directory of this source tree.
6 *
7 * @emails react-core
8 */
9
10 'use strict';
11
12 // TODO: can we express this test with only public API?
13 const getNodeForCharacterOffset =
14 require('react-dom-bindings/src/client/getNodeForCharacterOffset').default;
15
16 // Create node from HTML string
17 function createNode(html) {
18 const node = (getTestDocument() || document).createElement('div');
19 node.innerHTML = html;
20 return node;
21 }
22
23 function getTestDocument(markup) {
24 const doc = document.implementation.createHTMLDocument('');
25 doc.open();
26 doc.write(
27 markup ||
28 '<!doctype html><html><meta charset=utf-8><title>test doc</title>',
29 );
30 doc.close();
31 return doc;
32 }
33
34 // Check getNodeForCharacterOffset return value matches expected result.
35 function expectNodeOffset(result, textContent, nodeOffset) {
36 expect(result.node.textContent).toBe(textContent);
37 expect(result.offset).toBe(nodeOffset);
38 }
39
40 describe('getNodeForCharacterOffset', () => {
41 it('should handle siblings', () => {
42 const node = createNode('<i>123</i><i>456</i><i>789</i>');
43
44 expectNodeOffset(getNodeForCharacterOffset(node, 0), '123', 0);
45 expectNodeOffset(getNodeForCharacterOffset(node, 4), '456', 1);
46 });
47
48 it('should handle trailing chars', () => {
49 const node = createNode('<i>123</i><i>456</i><i>789</i>');
50
51 expectNodeOffset(getNodeForCharacterOffset(node, 3), '123', 3);
52 expectNodeOffset(getNodeForCharacterOffset(node, 9), '789', 3);
53 });
54
55 it('should handle trees', () => {
56 const node = createNode(
57 '<i>' +
58 '<i>1</i>' +
59 '<i>' +
60 '<i>' +
61 '<i>2</i>' +
62 '<i></i>' +
63 '</i>' +
64 '</i>' +
65 '<i>' +
66 '3' +
67 '<i>45</i>' +
68 '</i>' +
69 '</i>',
70 );
71
72 expectNodeOffset(getNodeForCharacterOffset(node, 3), '3', 1);
73 expectNodeOffset(getNodeForCharacterOffset(node, 5), '45', 2);
74 expect(getNodeForCharacterOffset(node, 10)).toBeUndefined();
75 });
76
77 it('should handle non-existent offset', () => {
78 const node = createNode('<i>123</i>');
79
80 expect(getNodeForCharacterOffset(node, -1)).toBeUndefined();
81 expect(getNodeForCharacterOffset(node, 4)).toBeUndefined();
82 });
83 });